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78 lines
2.7 KiB
78 lines
2.7 KiB
7 years ago
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package storage
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import (
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"bytes"
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"crypto/md5"
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"encoding/base64"
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"fmt"
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"net/http"
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"net/url"
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"time"
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)
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// PutAppendBlob initializes an empty append blob with specified name. An
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// append blob must be created using this method before appending blocks.
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//
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// See CreateBlockBlobFromReader for more info on creating blobs.
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//
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// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Put-Blob
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func (b *Blob) PutAppendBlob(options *PutBlobOptions) error {
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params := url.Values{}
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headers := b.Container.bsc.client.getStandardHeaders()
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headers["x-ms-blob-type"] = string(BlobTypeAppend)
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headers = mergeHeaders(headers, headersFromStruct(b.Properties))
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headers = b.Container.bsc.client.addMetadataToHeaders(headers, b.Metadata)
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if options != nil {
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params = addTimeout(params, options.Timeout)
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headers = mergeHeaders(headers, headersFromStruct(*options))
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}
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uri := b.Container.bsc.client.getEndpoint(blobServiceName, b.buildPath(), params)
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resp, err := b.Container.bsc.client.exec(http.MethodPut, uri, headers, nil, b.Container.bsc.auth)
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if err != nil {
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return err
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}
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return b.respondCreation(resp, BlobTypeAppend)
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}
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// AppendBlockOptions includes the options for an append block operation
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type AppendBlockOptions struct {
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Timeout uint
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LeaseID string `header:"x-ms-lease-id"`
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MaxSize *uint `header:"x-ms-blob-condition-maxsize"`
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AppendPosition *uint `header:"x-ms-blob-condition-appendpos"`
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IfModifiedSince *time.Time `header:"If-Modified-Since"`
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IfUnmodifiedSince *time.Time `header:"If-Unmodified-Since"`
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IfMatch string `header:"If-Match"`
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IfNoneMatch string `header:"If-None-Match"`
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RequestID string `header:"x-ms-client-request-id"`
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ContentMD5 bool
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}
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// AppendBlock appends a block to an append blob.
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//
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// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Append-Block
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func (b *Blob) AppendBlock(chunk []byte, options *AppendBlockOptions) error {
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params := url.Values{"comp": {"appendblock"}}
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headers := b.Container.bsc.client.getStandardHeaders()
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headers["x-ms-blob-type"] = string(BlobTypeAppend)
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headers["Content-Length"] = fmt.Sprintf("%v", len(chunk))
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if options != nil {
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params = addTimeout(params, options.Timeout)
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headers = mergeHeaders(headers, headersFromStruct(*options))
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if options.ContentMD5 {
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md5sum := md5.Sum(chunk)
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headers[headerContentMD5] = base64.StdEncoding.EncodeToString(md5sum[:])
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}
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}
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uri := b.Container.bsc.client.getEndpoint(blobServiceName, b.buildPath(), params)
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resp, err := b.Container.bsc.client.exec(http.MethodPut, uri, headers, bytes.NewReader(chunk), b.Container.bsc.auth)
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if err != nil {
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return err
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}
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return b.respondCreation(resp, BlobTypeAppend)
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}
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